Blank paper, crafted from the paper press, should be stackable. Currently, I make paper, and only one piece stacks per slot. Not very intuitive, given an inventory system that lets you stack massive logs.
Please fix ASAP!
One of my highest frustrations is that when you're crafting anything (food in the stove, anything in the forge, etc.) you can only do the 9 at a time. I wish there was a way to do stacks of crafting (like stacks of 10 or 25 glass in the kiln, stacks of ingots, etc) to make the process a little less...